Field-induced anisotropic magnetization in the amorphous thin film

Abstract

Magnetization measurements have been carried out on the amorphous thin film in magnetic fields up to 60 kG and in the temperature range 3 - 175 K for both the zero-field-cooling (ZFC) and field-cooling (FC) cases. At the lowest temperatures, for the FC case, the magnetization M parallel to the cooling field significantly differs from M perpendicular to it. This anisotropy was about 10 at T = 3 K and H = 60 kG, and it disappears completely at about T = 10 K. These results suggest cluster formation of strongly correlated and localized electrons. This assertion has been supported by resistivity measurements.